Frost thermostats.
I know that they trigger the electrical signal at a pre-determined low point (say 3 degrees C), but are unsure about the wiring (don't have installation plan)?
CH stats operate if they need to when "asked" by the programmer, then switched to either two-port or three-port valve to DHW or CH position. This then starts the boiler and pump when triggered.
OK, where in this series of operations does a Frost Stat work to start the boiler to prevent frost damage? Surely it would have to over ride all timed heating cycles to say prevent damage at 3am.
If the frost stat was on an S plan surely it would have to also open a valve for heat to flow??
Please explain?
Mike
I know that they trigger the electrical signal at a pre-determined low point (say 3 degrees C), but are unsure about the wiring (don't have installation plan)?
CH stats operate if they need to when "asked" by the programmer, then switched to either two-port or three-port valve to DHW or CH position. This then starts the boiler and pump when triggered.
OK, where in this series of operations does a Frost Stat work to start the boiler to prevent frost damage? Surely it would have to over ride all timed heating cycles to say prevent damage at 3am.
If the frost stat was on an S plan surely it would have to also open a valve for heat to flow??
Please explain?
Mike